.box {
    position: relative;
    margin: 30px;
    width: 450px;
    display: inline-block;
}

.img {
    width: 320px;
    height: 180px;
    border: 1px solid #333;
    position: relative;
    background: url(./img/降魔大圣\(缩小2\).jpg) no-repeat;
    background-size: contain;
}

.img>.mask {
    width: 50px;
    height: 50px;
    background-color: yellow;
    opacity: .4;
    position: absolute;
    top: 0px;
    left: 0px;
    display: none;
}

ul {
    display: flex;
    list-style: none;
    margin-top: 10px;
}

ul>li {
    width: 64px;
    height: 36px;
    border: 1px solid #333;
    margin-right: 10px;
    cursor: pointer;
}

ul>li.active {
    border-color: red;
}

.enlarge {
    width: 300px;
    height: 300px;
    position: absolute;
    top: 0;
    left: 101%;
    background: url(./img/降魔大圣\(缩小1\).jpg) no-repeat;
    background-size: 1280px 720px;
    background-position: 0 0;
    display: none;
}